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Straw tubes for forward tracking at the NLC

Straw tubes for forward tracking at the NLC. O.K. Baker, K. McFarlane, V. Vassilikopolus Hampton University Arlington, TX Jan 9-11, 2003. Hampton University. More than 12 years of experience in design, construction, and operation of wire chambers for experiments (JLAB, ATLAS). Planar

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Straw tubes for forward tracking at the NLC

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  1. Straw tubes for forward tracking at the NLC O.K. Baker, K. McFarlane, V. Vassilikopolus Hampton University Arlington, TX Jan 9-11, 2003

  2. Hampton University . . . • More than 12 years of experience in design, construction, and operation of wire chambers for experiments (JLAB, ATLAS). • Planar • straw tube • Resources exist for taking on major projects • NSF-funded Physics Frontiers Center • proximity to Jefferson Lab • quality students and staff (PhD program at HU)

  3. Hampton UniversityATLAS at the LHC Hampton collaborating on the barrel TRT construction

  4. Transition Radiation Tracker: straw tubes • Straws are: • 4 mm diameter • ~1.2 meters in length • carbon fiber reinforced • wire supports inserted • processed for stringent LHC requirements • 30 m W wire • Xe:CO2:CF4 gas (100 m/ns drift velocity)

  5. Transition Radiation Tracker: straw tubes • Designed to handle: • 1034 cm-2 s-1 luminosity • 14 MHz per straw • reliable operation for a decade • operate in 2T field

  6. HU facilities: A TRT Barrel Module Type-2 module (520 ‘straws’) Module being Set up for test

  7. Simulated Events As they will ‘look’ after computer reconstruction

  8. Hampton construction tasks • A collaboration with Duke and Indiana on ATLAS barrel TRT • Hampton: • Procure some TRT components • Process components (~64k ‘straws,’ matching numbers of other parts) • ‘String’ a fraction of the modules (about 17%) and complete mechanical construction (new) • Test all modules for uniformity of gain • Provide Module Gain Mapper for CERN

  9. HU Production Facility Clean Room (Class 10,000) ~ 1200 sq ft. Sensor production and module stringing

  10. Hampton U Module Test Stand

  11. HU: Module gain test • Uniformity of gas gain is test of quality of module • Low gain areas will result in loss of tracking and TR efficiency • High gain areas may break down • Window is not large: 8-10% • Every wire must have its gain measured mapped at intervals along its entire length

  12. Production at Hampton Original plan Required rate of production doubled

  13. Gain map at Hampton Gain variation, 0 to 10% Z position Straw number (1-520)

  14. Students

  15. Wire chamber design and construction at Hampton

  16. R&D at Hampton x Carbon-loaded Kapton straw tube wire chamber provides z-coordinate readout (in addition to x). z y NIM A332, 469 (‘93); NIM A348, 307 (‘94)

  17. Hampton Staff Base Production Alan Fry (PE) Chuck Long (ST) Carolyn Griffin Jackie Hodges P. Wilkins Aida Kelly O.K. Baker K.W. McFarlane V. Vassilakopoulos

  18. Hampton University:straw tubes for forward tracking • Propose to use straw tube wire chambers for forward tracking in the NLC spectrometer. • Possibility to get bunch timing information. • Robust, proven technology. • HU track record in large projects. • Resources (base) for taking on this project.

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